| static-members/alternative/point.cc - Implementation of class Point. | Lecture 4 - slide 25 : 40 Program 6  | 
#include <cmath>
#include <iostream>
#include "point.h"
Point::Point(double x_coord, double y_coord): x(x_coord), y(y_coord){
}
Point::Point(): x(defaultPoint().x), y(defaultPoint().y) { 
}
double Point::getx () const{
  return x;
}
Point& Point::defaultPoint(){    // Returns a reference to 
  static Point pt(5,7);          // local static variable
  return pt;
}
  
double Point::gety () const{
  return y;
}
void Point::move(double dx, double dy){
    x += dx; y += dy;
}
double Point::distance_to(Point p) const{
    return sqrt((x - p.x) * (x - p.x) + (y - p.y) * (y - p.y));
}
Point Point::origo(){
  return Point(0,0);
}
std::ostream& operator<<(std::ostream& s, const Point& p){
  return s << "(" << p.getx() << "," << p.gety() << ")" ;
}